You’d be surprised. Most are descriptive, others are simply named after the founders. Some spent a few moments with a thesaurus, naming themselves Metaphor, Lexicon, Catchword, Idiom, etc.
Those from the Obfuscating School of Naming cobbled together a string of letters based upon languages their target audience doesn’t speak – perhaps just because they could get the dot com: Nomenon, Nomina, Nomino, Tanj, Zinzin, Cintara, et al.
The full list of Naming Agency names resides here, humanely caged for your viewing pleasure.